Electric lamp



Nov. 29, 192 7.

F. A. ANDERSON.

ELECTRIC LAMP Filed Sept. 29. 1922 Patented Nov. 29, 1927.

UNITED STATES PATENT OFFICE.

FRITZ A. ANDERSON, OF MILTON, WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

THE BURDICK CORPORATION, 0F MILTON, WISCONSIN, A CORPORATION OF DELA- WARE.

ELECTRIC LAMP.

Application filed September 29, 1922. Serial No. 591,415.

This invention relates to electric lamps.

It will be explained as applied to a lamp especially adapted for therapeutic purposes.

The lamp ordinarily comprises a sealed tube containing electrodes for producing or generating the desired rays, a housing for protecting the tube and serving as a jacket for the circulation of a cooling iluid, and various kinds of lenses and screens for conic trolling the character and application of the rays projected from the lamp. The rays are produced by the discharge between electrodes within the tube.

The discharge, and consequently the intensity of the rays produced, can be controlled by regulating the temperature of thel tube,

-especially the temperature in the neighborhood of the cathode.

One of the objects of this invention is to provide a lamp with an improved temperature adjustment and control.

Another object is to provide a control which is simple, reliable and efficient.

Another object is to provide a control which may be readily manipulated by the operator while the lamp is in operation.

Another object is to provide a means for readily controlling the amount of heat dissipated from the lamp or generator and thereby control its operating temperature.

ther objects and advantages will hereinafter appear.

An embodiment of the invention is illustrated in the accompanying drawing, wherein Fig. 1 is a partial vertical section through a complete lamp.

Fig. 2 is a section on the line 2-2 of Fig-1.

Fig. 3 is a similar view with the outer or retaining plate of the temperature regulator removed.

Fig. 4 is a similar view with the movable cam plate of the regulator removed.

Fig. 5 is a similar view with the shutter plate of the regulator removed, and

Fig. 6 is a perspective of one of the shutters used to control the operating temperature of the tube.

The lamp housing comprises an outer casin or wall l including a lens 2 and an inner tu ular casing or wall 3 including a lens 4:. The casings are interconnected by sealing end walls 5 so that the space therebetween forms a circulating chamber 6 for a coolingv fluid. The cooling fluid may enter the chamber through an inlet 7 and leave thru an outlet 8. An apertured plate 9 in the chamber insures proper circulation of the lluid thru the space between the aligned lenses 2 and 4 to facilitate the cooling of the lenses and the rays passing therethru. The ends of the housing are closed by ventilated removable covers 10.

' The bore of inner casing 3 is adapted to receive a lamp in the form of a ray generator or tube 15. For the production of ultra violet rays the tube may have an anode 16, a cathode 17, and a body of mercury 18 -Sealed therein. The upper end of the tube is supported and electrical connection is made to anode 16 by a suitable screw terminal 19. The lower end of the tube is resiliently supported and electrical connection is made to cathode 17 by a'terminal 20. A terminal support, such as shown, is disclosed and claimed in my co-pending application Serial No. 524,089; tiled December 22, 1921. Conducting leads 21 and 22 interconnect terminals 19 and 20, respectively, with the appropriate contacts of a suitable plug connector 23 which is secured to the'housing.

The ray intensity of the mercury generator or tube depends upon the current flowing therethrough. The current can be regulated by varying the temperature of the tube, especially in the vicinity of the cathode. Heretofore considerable difficulty has been experienced in varying the tube temperature.

In the improved lamp housing the lamp temperature is made readily controllable by means of a shutter arrangement whose relation to the tube may be readily changed to vary the heat dissipated therefrom. Varying the heat dissipated from the tube will alter its temperature and consequently control the current flowing therethrough.

A series of pivotallyT mounted shutters 25, of metal or other suitable material, are so mounted between the tube and the inner wall of the cooling fluid chamber that they may be turned to dissipate a greater or lesser amount ol the heat which is generated by the discharge in the tube and pas-ses therefrom to the lluid in the cooling chamber.`

Each shutter has a pair of pivots 26 and 27 upon which the shutter may be rotated. Pivots 26' of the shutters are positioned in suitable bearing depressions in a flanged ring 28 which may be suitably secured to the inner chamber. Pivots 27 are seated in openings in an annular shutter plate 29 seated against the bottom wall 5 of the circulating chamber. wall 5 by suitable means such as solder.

Each shutter 25 has an operating lug or projection 30. Lugs project through Suitable curved slots 31 in shutter plate 29 and serve as the means for moving the shutters as will be hereinafter described. Lugs 30 also extend into curved cam slots 32 in a rotatable annular cam plate 33 which lies against shutter plate 29. An annular flanged cover plate 34 tits over plates 29 and 33 and is secured to the latter by suitable means such as solder or rivets 35. Cover plate 34 is movably secured in place by suitable lugs 36 which are secured to Wall 5 by suitable means such as solder. Cover plate 34 has an operating lever 37 secured thereto. Lever 37 projects through a slot in casing 1 so as to be readily accessible to the operator. The

relation of lugs 30 and cam slots 31 is such that when cam plate 33 is rotated the shutters are moved about their pivots in one direction or the other, depending upon the direction of rotation of cam plate 33. Since cam plate 33 is rotated by cover plate 34, being secured thereto, the movement of the shutters is under the control of operating lever 37.

The shutters may be moved fron one extreme position as shown by the full lines of Fig. 5 to another extreme position as shown by the dotted lines of Fig. 5 and, of course, to any intermediate position. When in the position shown by the full lines, the shutters throughout are in the position of maximum separation from the tube. Thus the conduction of heat from the tube, which passes through the shutters, to the cooled inner casing is at a minimum and the temperature ot' the tube is relatively high. This relatively high temperature causes a relatively small current to flow through the tube. In the other positions of the operating lever, the free ends ot' the shutters may be moved closer to the tube and against the same with different pressures and areas of Contact. Thus the conduction of heat from the tube through the shutters to the cooled inner casing may be made relatively much greater. The temperature of the tube is thereby reduced and the current therethrough is relatively great. 'Ihe lamp may be calibrated so that the current through the tube for a given position of the shutter operating lever may be known.

Having described my invention what I Plate 29 may be secured to claim as new and desire to secure by Letters Patent, is

1. A therapeutic lamp housing com rising a casing for enclosing a lamp, movab e heat conducting members within the casing for varying the amount of heat dissipated from the lamp so as to control its tem rature, and lneans operable from the outsi e of the casing for actuating said members. i 2. A therapeutic lamp housing comprislng a casino' adapted to be cooled by a cooling fluid, a movable heat conducting member within the casing adapted for movement relative to a lamp mounted therein so as to alter the amount of heat conducted from a lamp to the casing, and means operable from the outside of the casing for moving said member.

3. A lamp housing comprising a double walled tubular casing for providing a chamber for a cooling iuid, a lamp support for holding a lamp in the casing, and a pivotally mounted shutter interposed between the casing and the position to be occupied by a lamp and acting to control the interchange of heat between the lamp and casing.

4. A lamp housing comprismg an inner casing and an outer casing separated to provide a cooling iluid circulating chamber therebetween, a support for holding a lamp in the casing, a series of shutters pivotally carried by the casing and interposed between the inner casing and the lamp position to control the heat dissipated by a lamp held by the support, and a lever for controlling the position of the shutters.

5. A lamp housing vcomprising a tubular casing, a support for holding a lamp in the casing, a pivotally mounted shutter, a mov able cam plate for controlling the position of the shutter, and means for moving the plate from the outside of the casing.

6. A therapeutic lamp housing comprising a Water cooled casing for holding a lamp, there bemflr an air space between a portion of the lamp and the casing, adjustable means in said space for varying the rate of heat dissipation from the lamp to said casing, and means operable from outside said casing for controlling said adjustable means.

7. A therapeutic lamp housin comprising a water cooled casing for hol ing a lamp -`tube, a shutter in heat conducting contact FRITZ A. ANDERSON. 

